大口径管道水平定向钻穿越大型河流施工风险控制研究  

A Study on Risk Control of Horizontal Directional Drilling for Large-Diameter Pipelines Crossing Large Rivers During the Construction

作　　者：魏琦 WEI Qi(China Railway Construction Bridge Engineering Bureau Group Fourth Engineering Co.Ltd.,Harbin Heilongjiang 150000,China)

机构地区：[1]中铁建大桥工程局集团第四工程有限公司,黑龙江哈尔滨150000

出　　处：《铁道建筑技术》2024年第3期188-192,共5页Railway Construction Technology

基　　金：中国铁建大桥工程局集团有限公司科技开发计划项目(2021-B-18)。

摘　　要：长距离大口径管道水平定向钻穿越大型河流施工,由于其地质条件复杂、回拖阻力大等因素,施工风险大。本文以南水北调中线工程水平定向钻穿越潮白新河段为例,通过分析水平定向钻施工过程中周边环境、地质不均、施工工艺、设备故障、钻具、导向控制等风险,并提出相应控制措施。实践表明:选取具有交流定向钻地磁控向系统的水平定向钻钻机,根据不同地层选用不同配比、不同性能的泥浆,管道发送形式选用发送沟注水与猫背方式,管道回拖采用钢管内穿PE管注水等控制措施,使钻进轨迹满足设计要求,防止塌孔、缩径、回拖过程中管道防腐层破坏以及焊口的断裂等风险发生,相关经验值得借鉴。Horizontal directional drlling for long-distance,large-diameter pipelines across large rivers poses significant construction challenges attributed to intricate geological conditions and substantial drag resistance.This paper focuses on the analysis of risks encountered during the horizontal directional drilling of the Central Line Project of South-to-North Water Diversion,particularly in the New Chaobai River section.The identified risks encompass the surrounding environment,geological irregularities,construction technology,equipment failures,drilling tools,and directional control.In response to these challenges,this paper proposes coresponding control measures.The practical significance of the study is validated through insights gained from the selection of a horizontal directional drlling rig featuring an AC geomagnetic control system,the use of mud with varying ratios and properties tailored to different geological formations,and the adoption of water injection methods,especially through delivery trench and cat-back procedures for pipeline delivery.In addition,control measures such as water injection through PE pipelines inside steel pipelines during the dragging-back process are essential to ensure the drlling trajectory aligns with the design specifications.This approach fectively mitigates risks such as collapse,shrinkage damage to the anti-corrosion layer of the pipe,and fractures in weld joints during the back-dragging phase.The relevant experience is worth learning from.

关 键 词：管道工程 水平定向钻 大口径 风险控制 大型河流 

分 类 号：TV672.2[水利工程—水利水电工程]